Companhia de Saneamento Básico do Estado de São Paulo - SABESP: Stock Split Information

Companhia de Saneamento Básico do Estado de São Paulo – SABESP (SABESP) announced that its Extraordinary General Meeting approved a 1:5 stock split for all its common shares. This means each existing common share will be divided into five, with no change to the company's share capital. Following the split, SABESP will have 3,524,534,025 common shares and one special class preferred share held by the State of São Paulo. The shares will trade ex-split starting April 29, 2026, with shareholders of record on April 28, 2026, receiving the split shares by April 30, 2026. These new shares will carry the same rights as the original shares, including participation in dividends and other distributions. The company's CFO and Head of Investor Relations, Daniel Szlak, provided this information on April 28, 2026.